Consistent export of shells by having each vertex defined only once and shared by edges 

Based on          IFC2x3

Initiator            ISG Meeting-Prague

Effects              Extended Coordination View

Date                    2008 02 26


For each IfcClosedShell and IfcOpenShell, used e.g. in IfcFacetedBrep, or in IfcShellBasedSurfaceModel, each vertex shall only be exported once. Edges shall share identical vertices.

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